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it 引导的几个特殊句型,不仅是英语初学者的难点、易混点,而且也是近几年高考的热点之一。现就其用法作如下归纳。一、“It+be+一段时间(long/years/months/weeks)+before 从句”此句型分两种情况:如果主句用将来时(will be),则before 从句用一般现在时,意为“多长时间以后将发生某事”;如果主句用过去时 was,则 before 从句也用过去时,意为“多长时间后发生了某事”。
It guides several special sentence patterns, which is not only difficult and easy to confuse English beginners, but also one of the hot topics of the college entrance examination in recent years. We will now summarize its usage as follows. First, “It+be+ for a period of time (long/years/months/weeks)+before clause ” This sentence is divided into two cases: If the main sentence uses future (will be), then the before clause uses the present tense, It means “How long will it happen?”; if the main sentence is past time, then the before clause also uses past time, which means “How long after something happened”.